4. The path of a stone thrown into a river is modeled by the equation h=-02 +50 +84 where 'd' represents the distance of the stone horizontally and 'h' represents the height of
the stone
a) How far does the stone travel before it hits
the water?
b) What is the maximum height of the stone and how far horizontally is the stone when
it reaches its maximum height?

step-by-step explanation:

24/56=hx^7

step-by-step explanation:

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!